Hydraulic elevator.



G. E. OSGHGER.

HYDRAULIC ELEVATOR.

APPLICATION FILED AUG. 31, 1906.

1,1 16,615, Patented Nov. 10, 1914.

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Hm; M II HIE NORRIS PETERS 60., P148110 LITI: WASH/NI; Hm. I) 1 CHARLES E. OSCHGER, OF PITTSBURGH, PENNSYLVANIA.

HYDRAULIC ELEVATOR.

i To all whom it may concern:

Be it known that I, CrrAnLns E. OSGI-IGER, of lrittsburgh, Allegheny county, Pennsylvania, have invented a new and useful Hydraulic Elevator, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in

Figurel is a side elevation, partly diagrammatic, showing one form of my invention; and Fig. is a detail View of the relief valve and check valve.

My invention relates to the class of hydraulic GlGVtttOlS, and is designed toprovide a simple cushioning apparatus which will enable the elevator to be stopped more suddenly both on ascent and descent, without jarring or jumping.

In the drawings, 2 represents the. elevator car, 3 the plunger therefor, and at the hydraulic cylinder for the plunger,the ap' paratus being shown in this case as at tached to a plunger elevator, although it may be employed with a horizontal cylinder elevator or a vertical cylinder elevator. 6 designates the controllingvalve having inlet port 7 connected to a suitable source of supply, the exhaust port 8 and the outlet port 9 communicating with pipe 10, leading to the cylinder 4-. The valve stem ll carries the three pistons or disks 12, 13 and 14, being so arranged that in one position of the valve there is a free connection between the ports 7 and 9, while the port 8 is closed. In its second position, the ports 8 and 9 are connected, while the port 7 is closed, and in the third or intermediate position of rest, both of said ports 7 and 8 are closed.

The pipe 10 leading to the cylinder 1 has a branch 15, provided with a downwardly seating relief valve 16. This relief valve controls the entrance of the water into a cushioning cylinder or reservoir 17 which has been filled with water to a predetermined height; From the lower end of the cylinder or reservoir a pipe 19 connects with the pipe15, through a spring-messed check valve 18. The upper end of the cushioning cylinder or reservoir is provided with pipe 21,:having a pet-cock-QO which is normally closed. The cylinder or reservoir is also provided with a gage glass -22, which indicates the heightof water therein, and from the lower part of the cylinder or reservoir a drain pipe 24 leads to a discharge Specification of Letters Patent.

Application filed. August 31, 1906. Serial No. 332,753.

cylinder or reservoir.

tank.

Patented Nov. 10, 1914.

tank 25. The pipe 2 1 is shown as provided with a drain valve 26 and with a gate valve 23, which controls the flow of the drainage water to the discharge tank. The pipe 15 is preferably provided with a gate valve27, between the pipe 10 and the relief valve 16.

The valves 16 and 18 are Springpressed valves and are preferably provided with adjusting devices 16" and 18, whereby the tension 01 the springs may be varied in order to set the valves to open at the desired pressure.

In starting the elevator car upwardly, the valves 12, 13 and 1-4; are in the position shown in the drawing, tl1ewater passing to cylinder 4: through the pipe 10. Then the caris stopped suddenly in its upward movement, the valves 12, 13 and let have been moved to theirintermediate positions, thereby cutting off the water supply to the cylinder 41-, and the upward movement of the carin the sudden stop causes the plunger to create a partial vacuum, which will be filled by water which is sucked back from the cushioning cylinder orreservoir 17 through the check valve 18 and pipe 1.9,

and into the cylinder. This will distend or tenuate the air confined in the upper part of the cushioning cylinder or reservoir, so that the elevator is brought to rest easily and the stop is cushioned.

In case the car is moving downwardly, the valves 12, 13 and 14lare moved to connect the ports 8 and 9,thereby allowing the water to escape from the cylinder 4 through the port 8. If a stop is made suddenly during descent, the back pressure in the pipe 15 will be sulficient to force open the relief alve 16, and the rush of water therethrough into the cushioningcylinder will compress the air therein and raise the water level. The car is thus stopped easily and is cushioned by the action of the water forced through the relief valve into the cushioning As soon as the back pressure is relieved, the valve 16 closes and the excess water forced into the cushioning cylinder or reservoir drains out through the siphon drain pipe into the discharge Thisdrain. pipe is of less area than the inlets through the relief valve, so that the water runs out more slowly than does the water forced in during the cushioning action. 1 l

If, by reason of leakage or other causes,

the volume of air in the upper part of the.

cushioning cyhncler or reservolr becomes too inder byv opening the pet-cock 20, when the.

car is cushioned on its descent. The relative amounts of air and water in the cylinder can thus be regulated.

The advantages of my invention result from the simplifying of the device and the double action of the single cushioning cylinder or reservoir, as compared with the device of my Patent Number 793,1d8 of June 27, 1905, in which case two of the devices would be-necessary for cushioning the stops in both directions. In the present case, the single cushioning reservoir acts to cushion the stoppage ot' the elevator in both directions by either compression or distention of the air in the cushioning chamber.

The form and arrangement of the cush ioning reservoir, the relief-and check valves therefor, and the connections may be widely varied. The apparatus may be employed in connection with a verticalcylinder elevator, a horizontal cylinder elevator, a plunger elevator, hydraulic elevators, or any other types of elevators, without departing from my invention.

The cushioning action may be easily regulated while the device is in operation by adjusting the device 16, which changes the tension of the spring on the relief valve. By thus-changing the spring pressure, the valve may be set to open at a higher or lower pressure, as desired, and thus may be set to suit the speed and pressure used in the particular elevator to which it is connected.

I claim:

1. In a hydraulic motor,'a cushioning reservoir connected to the supply line, and mechanism controlled by the stopping movement of the elevator car on its ascent and descent for distending and compressing the cushioning medium in said cylinder,-substantially as described.

2. In a hydraulic elevator, an actuating cylinder,a valve controlling said cylinder, a cushioning reservoir, and means controlled bythe'movem'ent ofthecar for distending and compressing the cushioning medium in said cylinder, substantially as described.

3. In a hydraulic elevator, an actuating cylinder, a controlling valve, a cushioning reservoir having an air space at one end, connections between the other end of the reservoir and the supply'and outlet pipefor the actuating cylinder, and valves in said connections controlled by the stopping movement of the elevator'car in ascent and descent, substantially as described.

4. In a hydraulic elevator, a cushioning reservoir having an air space at one end, connections between the other end of the cylinder and the hydraulic supply line to the elevator, and a relief valve and check valve in said connections and arranged to be actuated by the stopping of the elevator in ascent and descent, substantially as described.

5. In a hydraulic elevator, an actuating cylinder, a supply and outlet pipe leading thereto, acontrolling valve for said pipe, a cushioning reservoir connected to a branch of said pipe, and oppositely acting check valves controlling such connection, substantially as described.

6. In a hydraulic elevator, an, actuating cylinder, a supply and outletpipe therefor, valve means for controlling said pipe, a cushioning reservoir connected toa branch of said ;pipe, check valves for controlling.

such connection, and means for regulating the action of said cushioning reservoir, substantially A as a described.

7. In a hydraulic elevator, an actuating cylinder, a supply and outlet pipe therefor, valve mechanism for controlling said pipe, a cushioning reservoir connected to the said pipe, and a relief and supply channel connecting said reservoir and the supply and outlet pipe to the actuating cylinder, substantially as described.

'8. Ina hydraulic elevator, an actuating cylintleiya supply and outlet pipe therefor,

valve mechanism for controlling said pipe, a cushioning reservolr connected tosaid pipe containinga predetermined amount of water and air when the elevator is at rest, and

hand-controlled mechanism for regulating the volume of water and air contained in the cushioning reservoir, substantially as described.

9. In a hydraulic elevator, an actuating cylinder, a cushioning reservoir connected withthe supply and outlet of the actuating cylinder, and valves in'the connections and arranged to be "actuated by the stopping =movement of theielevator car in'ascent and descent, substantially as described.

10. In a hydraulic elevator, a cushioning reservoir connected to the hydraulic main through a supply and "relief channel, valve mechanism controlling the flow of water in the direction between the hydraulic line and. the cushioning reservoir, and a drain chan- =nel leading from the cushioning reservoir,

oppositely'acting check valves arranged to control the communication between the. reservoir' and the saidconnection, substantially asidescribed.

12. In ahydraulic cylinder,a supply and outlet pipe therefor, a'cushioning reservoir connected with said elevator, an actuating ervoir and connection in one direction, and

a second check valve arranged to control the communication in the opposite direction,

said valves being arrangedto be automatically operated by the movement of water in the supplyand outlet pipe, described.

13.111 a hydraulic elevator, an actuating cylinder, a supply and outlet pipe therefor, a cushioning reservoir connected with said pipe, oppositely acting check valves controlling the communication between the cushioning reservoir and the pipe, and arranged to be actuated by the movement of the actuating fluid in said pipe, and a relief pipe for the cushioning reservoir, substantially as described.

14. In a hydraulic elevator, a cushioning reservoir, a check valve for controlling the inlet to said reservoir, a second check valve controlling the outlet for the reservoir, and connections leading through said valves whereby they are operated by the actuating fluid of the elevator by the stopping movements of the elevator car, substantially as described.

15. In a hydraulic motor, a single cushioning reservoir connected to the supply line, and mechanism controlled by the movement of the car arranged to bring the cushioningdevice into action in movement ol the motor in both directions, substantially as described.

16. I11 a hydraulic elevator, a hydraulic cylinder, a cushioning device therefor, and a valve system arranged to automatically supply extra water to the cylinder from the cushioning device when a partial suction occurs therein, said valve system being also arranged to allow excess water to be forced from the cylinder to the cushioning device under excess pressure; substantially as described.

17. In a hydraulic elevator, a hydraulic cylinder having a cushioning reservoir, and a valve system arranged to allow Water to substantially as be sucked from the reservoir under suction in the cylinder when the elevator is suddenly stopped while moving in one direction, said valve system also being arranged to allow forcing of water into the reservoir under excess pressure when the elevator is moving in the opposite direction; substantially as described.

18. In a hydraulic elevator, a valve-controlled supply having connections arranged to supply extra water under a suction eflect in the cylinder, said connections being also arranged to allow forcing out of surplus water from the supply connections under excess pressure, substantially as described.

19. In a hydraulic cylinder, a hydraulic motor, a valve control therefor, and a single valve-controlled apparatus arranged to supply extra water under suction in the cylinder and allow forcing out of Water under excess pressure in the cylinder, substantially as described.

20. In a hydraulic motor, a hydrauliccylinder, a valve control therefor, and a single chamber or channel having valve connections arranged to supply extra Water to the supply side when suction occurs in the cylinder, said valve connections being arranged to allow forcing out of surplus water under excess pressure, substantially as described.

21. In a controlling device for hydraulic motors, a cylinder, valve mechanism for controlling the flow of water to and from one end of said cylinder, a closed reservoir containing water under a predetermined pressure, and a connection between the cylinder and the reservoir to permit the water to flow from one to the other to equalize the pressures therein when the valve mechanism is suddenly closed; substantially as described.

In testimony whereof, I have hereunto set my hand.

CHARLES E. OSCHGER. l/Vitnesses:

Gno. B. BLEMING, Gno. I-I. PARMELEE.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

